80640580 has 12 divisors (see below), whose sum is σ = 169345260. Its totient is φ = 32256224.

The previous prime is 80640569. The next prime is 80640583. The reversal of 80640580 is 8504608.

It can be written as a sum of positive squares in 2 ways, for example, as 59259204 + 21381376 = 7698^2 + 4624^2 .

It is not an unprimeable number, because it can be changed into a prime (80640583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2015995 + ... + 2016034.

It is an arithmetic number, because the mean of its divisors is an integer number (14112105).

Almost surely, 2^80640580 is an apocalyptic number.

It is an amenable number.

80640580 is an abundant number, since it is smaller than the sum of its proper divisors (88704680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80640580 is a wasteful number, since it uses less digits than its factorization.

80640580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032038 (or 4032036 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 80640580 is about 8980.0100222661. The cubic root of 80640580 is about 432.0339550928.

The spelling of 80640580 in words is "eighty million, six hundred forty thousand, five hundred eighty".